Added a few more increment classes. Added more to the Memory interface.
Implemented memory setters in Memory.java
Completed memory class accessors. Added tests.
Last of the increment opcodes implemented
Added a few opcode constants
Merge branch 'kevins_branch' into johns_branch
Pulled GameBoyRegisters fix from johns_branch
Update README.md
Added ascii mario, courtesy of Nemesissy @board8.com
Merge remote-tracking branch 'origin/master' into kevins_branch